///*
// * Copyright (c) 2010 Nicolas George
// * Copyright (c) 2011 Stefano Sabatini
// * Copyright (c) 2014 Andrey Utkin
// *
// * Permission is hereby granted, free of charge, to any person obtaining a copy
// * of this software and associated documentation files (the "Software"), to deal
// * in the Software without restriction, including without limitation the rights
// * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// * copies of the Software, and to permit persons to whom the Software is
// * furnished to do so, subject to the following conditions:
// *
// * The above copyright notice and this permission notice shall be included in
// * all copies or substantial portions of the Software.
// *
// * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// * THE SOFTWARE.
// */
//
///**
// * @file
// * API example for demuxing, decoding, filtering, encoding and muxing
// * @example transcoding.c
// */
//
//#include <libavcodec/avcodec.h>
//#include <libavformat/avformat.h>
//#include <libavfilter/buffersink.h>
//#include <libavfilter/buffersrc.h>
//#include <libavutil/opt.h>
//#include <libavutil/pixdesc.h>
//
//static AVFormatContext *ifmt_ctx;
//static AVFormatContext *ofmt_ctx;
//typedef struct FilteringContext {
//    AVFilterContext *buffersink_ctx;
//    AVFilterContext *buffersrc_ctx;
//    AVFilterGraph *filter_graph;
//} FilteringContext;
//static FilteringContext *filter_ctx;
//
//typedef struct StreamContext {
//    AVCodecContext *dec_ctx;
//    AVCodecContext *enc_ctx;
//} StreamContext;
//static StreamContext *stream_ctx;
//
//static int open_input_file(const char *filename)
//{
//    int ret;
//    unsigned int i;
//
//    ifmt_ctx = NULL;
//    if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
//        av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
//        return ret;
//    }
//
//    if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
//        av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
//        return ret;
//    }
//
//    stream_ctx = av_mallocz_array(ifmt_ctx->nb_streams, sizeof(*stream_ctx));
//    if (!stream_ctx)
//        return AVERROR(ENOMEM);
//
//    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//        AVStream *stream = ifmt_ctx->streams[i];
//        AVCodec *dec = avcodec_find_decoder(stream->codecpar->codec_id);
//        AVCodecContext *codec_ctx;
//        if (!dec) {
//            av_log(NULL, AV_LOG_ERROR, "Failed to find decoder for stream #%u\n", i);
//            return AVERROR_DECODER_NOT_FOUND;
//        }
//        codec_ctx = avcodec_alloc_context3(dec);
//        if (!codec_ctx) {
//            av_log(NULL, AV_LOG_ERROR, "Failed to allocate the decoder context for stream #%u\n", i);
//            return AVERROR(ENOMEM);
//        }
//        ret = avcodec_parameters_to_context(codec_ctx, stream->codecpar);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Failed to copy decoder parameters to input decoder context "
//                   "for stream #%u\n", i);
//            return ret;
//        }
//        /* Reencode video & audio and remux subtitles etc. */
//        if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
//                || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
//            if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
//                codec_ctx->framerate = av_guess_frame_rate(ifmt_ctx, stream, NULL);
//            /* Open decoder */
//            ret = avcodec_open2(codec_ctx, dec, NULL);
//            if (ret < 0) {
//                av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
//                return ret;
//            }
//        }
//        stream_ctx[i].dec_ctx = codec_ctx;
//    }
//
//    av_dump_format(ifmt_ctx, 0, filename, 0);
//    return 0;
//}
//
//static int open_output_file(const char *filename)
//{
//    AVStream *out_stream;
//    AVStream *in_stream;
//    AVCodecContext *dec_ctx, *enc_ctx;
//    AVCodec *encoder;
//    int ret;
//    unsigned int i;
//
//    ofmt_ctx = NULL;
//    avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename);
//    if (!ofmt_ctx) {
//        av_log(NULL, AV_LOG_ERROR, "Could not create output context\n");
//        return AVERROR_UNKNOWN;
//    }
//
//
//    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//        out_stream = avformat_new_stream(ofmt_ctx, NULL);
//        if (!out_stream) {
//            av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
//            return AVERROR_UNKNOWN;
//        }
//
//        in_stream = ifmt_ctx->streams[i];
//        dec_ctx = stream_ctx[i].dec_ctx;
//
//        if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
//                || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
//            /* in this example, we choose transcoding to same codec */
//            encoder = avcodec_find_encoder(dec_ctx->codec_id);
//            if (!encoder) {
//                av_log(NULL, AV_LOG_FATAL, "Necessary encoder not found\n");
//                return AVERROR_INVALIDDATA;
//            }
//            enc_ctx = avcodec_alloc_context3(encoder);
//            if (!enc_ctx) {
//                av_log(NULL, AV_LOG_FATAL, "Failed to allocate the encoder context\n");
//                return AVERROR(ENOMEM);
//            }
//
//            /* In this example, we transcode to same properties (picture size,
//             * sample rate etc.). These properties can be changed for output
//             * streams easily using filters */
//            if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
//                enc_ctx->height = dec_ctx->height;
//                enc_ctx->width = dec_ctx->width;
//                enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
//                /* take first format from list of supported formats */
//                if (encoder->pix_fmts)
//                    enc_ctx->pix_fmt = encoder->pix_fmts[0];
//                else
//                    enc_ctx->pix_fmt = dec_ctx->pix_fmt;
//                /* video time_base can be set to whatever is handy and supported by encoder */
//                enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
//            } else {
//                enc_ctx->sample_rate = dec_ctx->sample_rate;
//                enc_ctx->channel_layout = dec_ctx->channel_layout;
//                enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
//                /* take first format from list of supported formats */
//                enc_ctx->sample_fmt = encoder->sample_fmts[0];
//                enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate};
//            }
//
//            if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
//                enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
//
//            /* Third parameter can be used to pass settings to encoder */
//            ret = avcodec_open2(enc_ctx, encoder, NULL);
//            if (ret < 0) {
//                av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
//                return ret;
//            }
//            ret = avcodec_parameters_from_context(out_stream->codecpar, enc_ctx);
//            if (ret < 0) {
//                av_log(NULL, AV_LOG_ERROR, "Failed to copy encoder parameters to output stream #%u\n", i);
//                return ret;
//            }
//
//            out_stream->time_base = enc_ctx->time_base;
//            stream_ctx[i].enc_ctx = enc_ctx;
//        } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
//            av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
//            return AVERROR_INVALIDDATA;
//        } else {
//            /* if this stream must be remuxed */
//            ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
//            if (ret < 0) {
//                av_log(NULL, AV_LOG_ERROR, "Copying parameters for stream #%u failed\n", i);
//                return ret;
//            }
//            out_stream->time_base = in_stream->time_base;
//        }
//
//    }
//    av_dump_format(ofmt_ctx, 0, filename, 1);
//
//    if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
//        ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
//            return ret;
//        }
//    }
//
//    /* init muxer, write output file header */
//    ret = avformat_write_header(ofmt_ctx, NULL);
//    if (ret < 0) {
//        av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
//        return ret;
//    }
//
//    return 0;
//}
//
//static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx,
//        AVCodecContext *enc_ctx, const char *filter_spec)
//{
//    char args[512];
//    int ret = 0;
//    const AVFilter *buffersrc = NULL;
//    const AVFilter *buffersink = NULL;
//    AVFilterContext *buffersrc_ctx = NULL;
//    AVFilterContext *buffersink_ctx = NULL;
//    AVFilterInOut *outputs = avfilter_inout_alloc();
//    AVFilterInOut *inputs  = avfilter_inout_alloc();
//    AVFilterGraph *filter_graph = avfilter_graph_alloc();
//
//    if (!outputs || !inputs || !filter_graph) {
//        ret = AVERROR(ENOMEM);
//        goto end;
//    }
//
//    if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
//        buffersrc = avfilter_get_by_name("buffer");
//        buffersink = avfilter_get_by_name("buffersink");
//        if (!buffersrc || !buffersink) {
//            av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
//            ret = AVERROR_UNKNOWN;
//            goto end;
//        }
//
//        snprintf(args, sizeof(args),
//                "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
//                dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
//                dec_ctx->time_base.num, dec_ctx->time_base.den,
//                dec_ctx->sample_aspect_ratio.num,
//                dec_ctx->sample_aspect_ratio.den);
//
//        ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
//                args, NULL, filter_graph);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
//            goto end;
//        }
//
//        ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
//                NULL, NULL, filter_graph);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
//            goto end;
//        }
//
//        ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
//                (uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
//                AV_OPT_SEARCH_CHILDREN);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
//            goto end;
//        }
//    } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
//        buffersrc = avfilter_get_by_name("abuffer");
//        buffersink = avfilter_get_by_name("abuffersink");
//        if (!buffersrc || !buffersink) {
//            av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
//            ret = AVERROR_UNKNOWN;
//            goto end;
//        }
//
//        if (!dec_ctx->channel_layout)
//            dec_ctx->channel_layout =
//                av_get_default_channel_layout(dec_ctx->channels);
//        snprintf(args, sizeof(args),
//                "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64,
//                dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate,
//                av_get_sample_fmt_name(dec_ctx->sample_fmt),
//                dec_ctx->channel_layout);
//        ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
//                args, NULL, filter_graph);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
//            goto end;
//        }
//
//        ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
//                NULL, NULL, filter_graph);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
//            goto end;
//        }
//
//        ret = av_opt_set_bin(buffersink_ctx, "sample_fmts",
//                (uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt),
//                AV_OPT_SEARCH_CHILDREN);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
//            goto end;
//        }
//
//        ret = av_opt_set_bin(buffersink_ctx, "channel_layouts",
//                (uint8_t*)&enc_ctx->channel_layout,
//                sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
//            goto end;
//        }
//
//        ret = av_opt_set_bin(buffersink_ctx, "sample_rates",
//                (uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate),
//                AV_OPT_SEARCH_CHILDREN);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
//            goto end;
//        }
//    } else {
//        ret = AVERROR_UNKNOWN;
//        goto end;
//    }
//
//    /* Endpoints for the filter graph. */
//    outputs->name       = av_strdup("in");
//    outputs->filter_ctx = buffersrc_ctx;
//    outputs->pad_idx    = 0;
//    outputs->next       = NULL;
//
//    inputs->name       = av_strdup("out");
//    inputs->filter_ctx = buffersink_ctx;
//    inputs->pad_idx    = 0;
//    inputs->next       = NULL;
//
//    if (!outputs->name || !inputs->name) {
//        ret = AVERROR(ENOMEM);
//        goto end;
//    }
//
//    if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
//                    &inputs, &outputs, NULL)) < 0)
//        goto end;
//
//    if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
//        goto end;
//
//    /* Fill FilteringContext */
//    fctx->buffersrc_ctx = buffersrc_ctx;
//    fctx->buffersink_ctx = buffersink_ctx;
//    fctx->filter_graph = filter_graph;
//
//end:
//    avfilter_inout_free(&inputs);
//    avfilter_inout_free(&outputs);
//
//    return ret;
//}
//
//static int init_filters(void)
//{
//    const char *filter_spec;
//    unsigned int i;
//    int ret;
//    filter_ctx = av_malloc_array(ifmt_ctx->nb_streams, sizeof(*filter_ctx));
//    if (!filter_ctx)
//        return AVERROR(ENOMEM);
//
//    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//        filter_ctx[i].buffersrc_ctx  = NULL;
//        filter_ctx[i].buffersink_ctx = NULL;
//        filter_ctx[i].filter_graph   = NULL;
//        if (!(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
//                || ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
//            continue;
//
//
//        if (ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
//            filter_spec = "null"; /* passthrough (dummy) filter for video */
//        else
//            filter_spec = "anull"; /* passthrough (dummy) filter for audio */
//        ret = init_filter(&filter_ctx[i], stream_ctx[i].dec_ctx,
//                stream_ctx[i].enc_ctx, filter_spec);
//        if (ret)
//            return ret;
//    }
//    return 0;
//}
//
//static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) {
//    int ret;
//    int got_frame_local;
//    AVPacket enc_pkt;
//    int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) =
//        (ifmt_ctx->streams[stream_index]->codecpar->codec_type ==
//         AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;
//
//    if (!got_frame)
//        got_frame = &got_frame_local;
//
//    av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
//    /* encode filtered frame */
//    enc_pkt.data = NULL;
//    enc_pkt.size = 0;
//    av_init_packet(&enc_pkt);
//    ret = enc_func(stream_ctx[stream_index].enc_ctx, &enc_pkt,
//            filt_frame, got_frame);
//    av_frame_free(&filt_frame);
//    if (ret < 0)
//        return ret;
//    if (!(*got_frame))
//        return 0;
//
//    /* prepare packet for muxing */
//    enc_pkt.stream_index = stream_index;
//    av_packet_rescale_ts(&enc_pkt,
//                         stream_ctx[stream_index].enc_ctx->time_base,
//                         ofmt_ctx->streams[stream_index]->time_base);
//
//    av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
//    /* mux encoded frame */
//    ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
//    return ret;
//}
//
//static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
//{
//    int ret;
//    AVFrame *filt_frame;
//
//    av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n");
//    /* push the decoded frame into the filtergraph */
//    ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx,
//            frame, 0);
//    if (ret < 0) {
//        av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
//        return ret;
//    }
//
//    /* pull filtered frames from the filtergraph */
//    while (1) {
//        filt_frame = av_frame_alloc();
//        if (!filt_frame) {
//            ret = AVERROR(ENOMEM);
//            break;
//        }
//        av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n");
//        ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx,
//                filt_frame);
//        if (ret < 0) {
//            /* if no more frames for output - returns AVERROR(EAGAIN)
//             * if flushed and no more frames for output - returns AVERROR_EOF
//             * rewrite retcode to 0 to show it as normal procedure completion
//             */
//            if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
//                ret = 0;
//            av_frame_free(&filt_frame);
//            break;
//        }
//
//        filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
//        ret = encode_write_frame(filt_frame, stream_index, NULL);
//        if (ret < 0)
//            break;
//    }
//
//    return ret;
//}
//
//static int flush_encoder(unsigned int stream_index)
//{
//    int ret;
//    int got_frame;
//
//    if (!(stream_ctx[stream_index].enc_ctx->codec->capabilities &
//                AV_CODEC_CAP_DELAY))
//        return 0;
//
//    while (1) {
//        av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index);
//        ret = encode_write_frame(NULL, stream_index, &got_frame);
//        if (ret < 0)
//            break;
//        if (!got_frame)
//            return 0;
//    }
//    return ret;
//}
//
//int main(int argc, char **argv)
//{
//    int ret;
//    AVPacket packet = { .data = NULL, .size = 0 };
//    AVFrame *frame = NULL;
//    enum AVMediaType type;
//    unsigned int stream_index;
//    unsigned int i;
//    int got_frame;
//    int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);
//
//    if (argc != 3) {
//        av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <output file>\n", argv[0]);
//        return 1;
//    }
//
//    if ((ret = open_input_file(argv[1])) < 0)
//        goto end;
//    if ((ret = open_output_file(argv[2])) < 0)
//        goto end;
//    if ((ret = init_filters()) < 0)
//        goto end;
//
//    /* read all packets */
//    while (1) {
//        if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0)
//            break;
//        stream_index = packet.stream_index;
//        type = ifmt_ctx->streams[packet.stream_index]->codecpar->codec_type;
//        av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",
//                stream_index);
//
//        if (filter_ctx[stream_index].filter_graph) {
//            av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n");
//            frame = av_frame_alloc();
//            if (!frame) {
//                ret = AVERROR(ENOMEM);
//                break;
//            }
//            av_packet_rescale_ts(&packet,
//                                 ifmt_ctx->streams[stream_index]->time_base,
//                                 stream_ctx[stream_index].dec_ctx->time_base);
//            dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 :
//                avcodec_decode_audio4;
//            ret = dec_func(stream_ctx[stream_index].dec_ctx, frame,
//                    &got_frame, &packet);
//            if (ret < 0) {
//                av_frame_free(&frame);
//                av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
//                break;
//            }
//
//            if (got_frame) {
//                frame->pts = frame->best_effort_timestamp;
//                ret = filter_encode_write_frame(frame, stream_index);
//                av_frame_free(&frame);
//                if (ret < 0)
//                    goto end;
//            } else {
//                av_frame_free(&frame);
//            }
//        } else {
//            /* remux this frame without reencoding */
//            av_packet_rescale_ts(&packet,
//                                 ifmt_ctx->streams[stream_index]->time_base,
//                                 ofmt_ctx->streams[stream_index]->time_base);
//
//            ret = av_interleaved_write_frame(ofmt_ctx, &packet);
//            if (ret < 0)
//                goto end;
//        }
//        av_packet_unref(&packet);
//    }
//
//    /* flush filters and encoders */
//    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//        /* flush filter */
//        if (!filter_ctx[i].filter_graph)
//            continue;
//        ret = filter_encode_write_frame(NULL, i);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
//            goto end;
//        }
//
//        /* flush encoder */
//        ret = flush_encoder(i);
//        if (ret < 0) {
//            av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
//            goto end;
//        }
//    }
//
//    av_write_trailer(ofmt_ctx);
//end:
//    av_packet_unref(&packet);
//    av_frame_free(&frame);
//    for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//        avcodec_free_context(&stream_ctx[i].dec_ctx);
//        if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && stream_ctx[i].enc_ctx)
//            avcodec_free_context(&stream_ctx[i].enc_ctx);
//        if (filter_ctx && filter_ctx[i].filter_graph)
//            avfilter_graph_free(&filter_ctx[i].filter_graph);
//    }
//    av_free(filter_ctx);
//    av_free(stream_ctx);
//    avformat_close_input(&ifmt_ctx);
//    if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))
//        avio_closep(&ofmt_ctx->pb);
//    avformat_free_context(ofmt_ctx);
//
//    if (ret < 0)
//        av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret));
//
//    return ret ? 1 : 0;
//}
